VALLEJO — Vallejo labor union officials today doubled a reward for information leading to the arrest of suspects in the attack and robbery of a street maintenance worker Monday afternoon.

The Vallejo Police Department on Tuesday announced a $1,000 reward. The International Brotherhood of Electrical Workers Local 2376 has matched that amount, union president Frank Caballero said.

The incident has raised alarms about the safety of street maintenance workers, housing officials, engineers and other city workers who are out in public much of the time.

“Obviously they are a little rattled,” said Ken Shoemaker, the union’s vice president. “For these perpetrators to feel they could grab a city worker and treat him like that … it’s scary.” The incident, which was caught on a store surveillance video and recorded on a witnesses’ cell phone, occurred about 3:20 p.m. near a mini mart a half block from Vallejo High School, where many students were hanging out, police said.

One video shows the victim, wearing an orange work shirt, confronting a group of juveniles. Less than a minute later, he’s surrounded and being attacked as others run over and watch. The attack appeared to last less than a minute, police said.

Apparently the worker was trying to talk to some in the group who had thrown rocks at his equipment.

Police say while some people shown in the videos have been identified, they don’t have any leads on the beating suspects and believe people at the scene know who they are. They are working with Vallejo City Unified School District officials on identifications, although they don’t know if the suspects were Vallejo High School students.

Police said they didn’t know what motivated the attack.

The victim suffered a fractured skull, jaw damage, a small fracture to his scapula and required stitches, police said.